Summarized Financial Data - Chevron Transport Corporation (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Balance Sheet - Chevron Transport Corporation
Current assets	$ 56,104	$ 55,720
Current liabilities	33,413	34,212
Total Equity	144,164	137,832	131,289	122,181
Chevron Transport Corporation [Member]
Balance Sheet - Chevron Transport Corporation
Current assets	183	199
Other assets	385	313
Current liabilities	297	154
Other liabilities	413	415
Total Equity	$ (142)	$ (57)

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